CAPE CANAVERAL, Fla.—SpaceX’s next crew flight is off until at least next week, as NASA debates whether to bring astronauts back from the International Space Station before launching their replacements. Flight surgeons, meanwhile, are continuing to monitor the “minor medical issue” affecting one of four astronauts awaiting liftoff at NASA’s Kennedy Space Center. NASA said Thursday that the astronaut—whom they’re not identifying—should be fine before a possible launch attempt on Monday. But NASA may opt to first bring home the four astronauts living at the space station since April. The soonest they would return in their SpaceX capsule is Sunday; that would further postpone the next crew launch. “The weather in November can be especially challenging, so our goal is to move forward on the plan with the highest probability of mission assurance and crew safety,” NASA’s commercial crew program manager, Steve Stich, said in a statement. The U.S.-German crew …